Twenty years ago, if you walked into a casino, you had four choice of what to play that covered about 95% of the casino floor - Blackjack, Craps, Roulette and Slot Machines.  Flash forward to 2013 and the casino floor is quite a different place.  If I had to take an educated guess, I'd say that Blackjack and Slots have given up the most square footage.  Slot machines yield space to video poker and Blackjack yielded space to the myriad of new table games that have been invented and successfully invaded the casino.  For most of the time, only one blackjack variant managed to make any inroads.  This was Spanish 21.  While its popularity has diminished a bit, it is still quite a powerhouse in the industry.